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Drive <br /> 8JarvisSequoia Morgan Hill CA 95037 <br /> } (408)776 9600 <br /> Analytical FAX equoi 782 6308 <br /> corn www seyuoialabs com <br /> i <br /> URS Corporation[Arco II Project ARCO 95469,Stockton,CA M000479 <br /> 2870 Gateway Oaks Dr,Ste 300 Project Number G09JZ-0290 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 04/07/05 12 53 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - Morgan Hill <br /> Reportinb Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 5C25006-EPA 5030B PIT 1 EPA 8260B <br /> Laboratory Control Sample(5C25006-BS2) Prepared&Analyzed 03/25/05 <br /> Benzene 558 0 50 ugll 640 87 65-115 <br /> Ethylbenzene 786 0 50 752 105 75-135 <br /> Methyl tert-butyl ether 101 0 50 992 102 65-125 <br /> Toluene 33 2 0 50 31 9 104 85-120 <br /> Xylenes(total) 408 0 50 366 111 85-125 <br /> Gasoline Range Organics(C4-C12) 423 50 440 96 70-124 <br /> Surrogate 12-D:chloroethane-d4 5 86 500 117 60-135 <br /> Laboratory Control Sample Dup(5C25006-BSD1) Prepared&Analyzed 03/25/05 <br /> tent-Amyl methyl ether it 0 050 ug/l too 110 80-115 6 15 <br /> Benzene 101 050 100 101 65-115 7 20 <br /> W utyl <br /> alcohol 48 7 20 500 97 75-150 6 25 <br /> propyl ether 11 3 050 100 113 75-125 5 15 <br /> 1,2-Dibromoethane(EDS) 9 78 050 100 98 85-120 5 15 <br /> 1,2-Dtchloroethane 116 050 100 116 85-130 3 20 <br /> Ethanol 179 100 200 90 70-135 3 35 <br /> Ethyl tert-butyl ether 11 5 050 100 115 75-130 6 25 <br /> Ethylbenzene 9 89 050 100 99 75-135 5 15 <br /> Methyl cert-butyl ether 1 1 4 050 100 114 65-125 7 20 <br /> Toluene 975 050 100 98 85-120 5 20 <br /> Xylenes(total) 309 050 300 103 85-125 2 20 <br /> Surrogate 11-Dtchloroethane-d4 -536 5 00 107 60-135 <br /> Matrix Spike(5C25006-MS1) Source M000460-04 Prepared&Analyzed 03/25/05 <br /> Benzene 1300 25 ug/l 320 1100 62 65-115 LN <br /> Ethylbenzene 975 25 376 630 92 75-135 <br /> Methyl cert-butyl ether 1 180 25 496 720 93 65-125 <br /> Toluene 1610 25 1600 30 99 85-120 <br /> Xylenes(total) 2550 25 1830 560 109 85-125 <br /> Gasoline Range Organics(C4-C 12) 28400 2500 22000 10000 84 70-124 <br /> Surrogate 12-Dichloroethane-d4 562 Soo 111 60-135 <br /> Iruoia Analytical - Morgan Hill The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document Unless otherwise slated results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 19 of 30 <br />